September weather forecast
Kalispell, MT

A gorgeous sunset over the tranquil city of Kalispell, Montana
A gorgeous sunset over the tranquil city of Kalispell, Montana

Weather in September

The first month of the autumn, September, is still a comfortable month in Kalispell, Montana, with an average temperature ranging between min 39.9°F (4.4°C) and max 65.7°F (18.7°C).

Temperature

In Kalispell, the average high-temperature in September decreases from a moderately hot 77.4°F (25.2°C) in August to a comfortable 65.7°F (18.7°C). The average low-temperature, in Kalispell, is 39.9°F (4.4°C).

Humidity

The average relative humidity in September is 63%.

Rainfall

In September, the rain falls for 8.6 days. Throughout September, 0.91" (23mm) of precipitation is accumulated. In Kalispell, during the entire year, the rain falls for 142.8 days and collects up to 17.36" (441mm) of precipitation.

Snowfall

Months with snowfall in Kalispell are January through May, September through December. September is the first month it typically snows in Kalispell. Throughout September, in the average 0.2 snowfall days, it receives 0.04" (1mm) of snow. Throughout the year, in Kalispell, Montana, there are 104.7 snowfall days, and 51.34" (1304mm) of snow is accumulated.

Daylight

In Kalispell, the average length of the day in September is 12h and 34min.
On the first day of the month, sunrise is at 6:55 am and sunset at 8:18 pm. On the last day of September, sunrise is at 7:35 am and sunset at 7:18 pm MDT.

Sunshine

The average sunshine in September in Kalispell, Montana, is 9.4h.

UV index

In Kalispell, the average daily maximum UV index in September is 3. A UV Index estimate of 3 to 5 represents a moderate threat to health from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The average daily UV index of 3 in September transform into the following instructions:
Take precautions - Protection against sunburn is recommended. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the average humidity in September in Kalispell?

In September, the average relative humidity in Kalispell, Montana, is 63%.

How many days does it rain in September in Kalispell?

In Kalispell, Montana, in September, during 8.6 rainfall days, 0.91" (23mm) of precipitation is typically accumulated.

When does it start snowing in Kalispell?

September is the first month it typically snows. Throughout September, in the average 0.2 snowfall days, it receives 0.04" (1mm) of snow.

What is the average length of the day in September in Kalispell?

In September, the average day length in Kalispell, Montana, is 12h and 34min.

When is the sunrise / sunset in September in Kalispell?

In September, on the first day of the month, sunrise is at 6:55 am and sunset at 8:18 pm. On the last day of the month, in Kalispell, sunrise is at 7:35 am and sunset at 7:18 pm MDT.

How many hours of sunshine does Kalispell have in September?

The average sunshine duration in September in Kalispell is 9.4h.

What is the UV index intensity in September in Kalispell?

In September, the average daily maximum UV index in Kalispell, Montana, is 3. A UV Index reading of 3 to 5 represents a medium health risk from unsafe exposure to Sun's UV rays.

Average temperature in September
Kalispell, MT

Average temperature in September - Kalispell, MT
  • Average high temperature in September: 65.7°F

The warmest month (with the highest average high temperature) is July (77.5°F).
The month with the lowest average high temperature is December (25.9°F).

  • Average low temperature in September: 39.9°F

The month with the highest average low temperature is August (46.4°F).
The coldest month (with the lowest average low temperature) is February (14.4°F).

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Average pressure in September
Kalispell, MT

Average pressure in September - Kalispell, MT
  • Average pressure in September: 29.97"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

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Average wind speed in September
Kalispell, MT

Average wind speed in September - Kalispell, MT
  • Average wind speed in September: 3.8mph

The windiest month (with the highest average wind speed) is April (4.7mph).
The calmest month (with the lowest average wind speed) is August (3.7mph).

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Average humidity in September
Kalispell, MT

Average humidity in September - Kalispell, MT
  • Average humidity in September: 63%

The month with the highest relative humidity is January (93%).
The month with the lowest relative humidity is August (55%).

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Average rainfall in September
Kalispell, MT

Average rainfall in September - Kalispell, MT
  • Average rainfall in September: 0.91"

The wettest month (with the highest rainfall) is June (2.05").
The driest month (with the least rainfall) is August (0.55").

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Average rainfall days in September
Kalispell, MT

Average rainfall days in September - Kalispell, MT
  • Average rainfall days in September: 8.6 days

The month with the highest number of rainy days is April (17.9 days).
The month with the least rainy days is August (6.6 days).

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Average snowfall in September
Kalispell, MT

Average snowfall in September - Kalispell, MT
  • Average snowfall in September: 0.04"

The month with the highest snowfall is January (11.3").
The months with the least snowfall are June, July and August (0").

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Average snowfall days in September
Kalispell, MT

Average snowfall days in September - Kalispell, MT
  • Average snowfall days in September: 0.2 days

The month with the highest number of snowfall days is December (21.5 days).
The months with the least snowfall days are June, July and August (0 days).

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Average daylight in September /
Average sunshine in September
Kalispell, MT

Average daylight in September / Average sunshine in September - Kalispell, MT
  • Average daylight in September: 12h and 34min

The month with the longest days is June (Average daylight: 16h and 1min).
The month with the shortest days is December (Average daylight: 8h and 26min).

  • Average sunshine in September: 9.4h

The month with the most sunshine is July (Average sunshine: 11.9h).
The month with the least sunshine is January (Average sunshine: 3.7h).

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Average sunshine days in September
Kalispell, MT

Average sunshine days in September - Kalispell, MT
  • Average sunshine days in September: 19.6 days

The month with the most sunshine days is August (21.8 days).
The month with the least sunshine days is February (6.8 days).

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Average UV index in September
Kalispell, MT

Average UV index in September - Kalispell, MT
  • Average UV index in September: 3

The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 1).

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Average cloud cover in September
Kalispell, MT

Average cloud cover in September - Kalispell, MT
  • Average cloud cover in September: 23

The month with the most cloud cover is January (Cloud cover 63).
The months with the least cloud cover are July and August (Cloud cover 15).

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Average visibility in September
Kalispell, MT

Average visibility in September - Kalispell, MT
  • Average visibility in September: 6mi

The months with the highest visibility are May, June, July, August, September and October (6mi).
The month with the lowest visibility is January (3mi).

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